Loom whip roll mechanism



Dec. 23, 1947.

N. H. FQx 2,433,039

LOOM WHIP ROLL MECHANISM Filed Jan. 23, 1947 3 Sheets-Shet l uowsaeeys Dec. 23, 1947. N, H, Fox` 2,433,039

LOOM WHIP ROLL MECHANISM Dec. 23, 1947. N. H. Fox 2,433,039 LOOM WHIP ROLL MECHANISM Filed Jan. as, 1947 3 sneetssneet 3 Patented Dec. 23, 1947 LOM WHIP ROLL MECHANISM Norman H. Fox, Sanford, Maine, assignor to Goodall-Sanford, Inc., Sanford, Maine, a corporation of Maine Application January 23, 1947, Serial No. 723,874

6 Claims. l

This invention has for its object to effect the control of the whip roll in a loom so as to maintain the proper and required tension in the warps during the Weaving operation.

The invention has for its further object to maintain consistently the proper and required tension in the warps during the weaving operation by effecting the control of the Whip roll in coordination with a positive let-off mechanism.

The whip roll in a loom is moved forward by the warps when the lay beats in the filling in order to relieve the strain which would otherwise occur in the warps and still maintain the required tension therein. But during that portion of the cycle of loom operation when the lay is not beating in the filling at the fell and receding from engagement with the beaten-in filling, or in other words during the main portion of the cycle of loom operation the whip roll should stand substantially in a normal position and permit the warps to be fed forward by the functioning of the usual take-up and warp beam let-off operating mechanisms.

Great diculty has been experienced in securing the return of the whip roll after thebeat-up to its normal position and in maintaining it therein during this long period in the cycle of the loom operation. The present invention has for its object to overcome this difficulty and to secure proper functioning of the whip roll throughout the entire cycle of loom operation. This object is secured by a pendulum arm rigid with the rocking support of the whip roll and depending therefrom vertically when the whip roll is in normal position and by providing means, such as a weight or opposed springs, acting to restore the pendulum arm to vertical position when moved therefrom by movement of the whip roll.

The nature and objects of the invention will appear more fully from the accompanying description and drawings and will be particularly pointed out in the claims.

Since the invention is primarily concerned with the whip roll mechanism of a loom it is only necessary to illustrate in connection therewith so much of a loom mechanism as is necessary to a disclosure of preferred forms of the invention. While the invention in its broader aspects may be embodied in a loom having a so-called "conditional let-01T" mechanism for the warp beam with advantageous results in the control of the tension in the warps, it is particularly valuable when, and is herein illustrated as, coordinated with a positive let-off mechanism because then there Vis secured a continuous and uninterrupted flow of the warps with the tension therein properly and consistently maintained during the weaving opera-` invention together with portions of one type of loom to which the invention is applicable.

In the drawings:

Fig. 1 is a rear view, partially broken away, of the rear of the loom;

Fig. 2 is a view in elevation left of Fig. 1;

Fig. 2a is a detail showing a construction of looking toward the pendulum arm control different from that shown in Fig. 2; and,

Fig. 3 is a view in elevation looking toward the right of Fig. 1.

The side frames I and 2 of the loom have journaled therein at the rear the shaft 3 carrying the warp beam 4. In the type of loom illustrated the warps are drawn forward by suitable take-up mechanism at the front of the loom Which is unnecessary to illustrate, and the warps are positively drawn off from the warp beam in coordination therewith. A common form of friction brake mechanism is illustrated. For this purpose the warp beam shaft 3 has secured thereto a pulley 5. A brake band 6 frictionally engages the pulley 5, is secured at one end as l to the loom frame and at the other end 8 to a lever 9 fulcrumed at Ill on the loo-m frame. To the rear end of the lever I0 is suspended one or more weights I In By this means any required degree of frictional resistance to the rotation of the warp beam is secured.

The whip roll I2 is carried by a whip roll support journaled on the loom frame transversely thereof. This support is shown as a shaft I3 journaled in the side frames and having rigidv therewith near each end radial arms I4 in which the whip roll is journaled. The whip roll is thus mounted on the support parallel to the journal axis or shaft I3 of the support.

A rigid pendulum arm I5 is rigidly connected with or secured to the whip roll support and is arranged to stand in a vertical position depending from the support when the whip roll and its support is in normal position. The normal position is illustrated in the drawings and in the particular construction there illustrated the Whip roll is in vertical alinement with the pendulum arm, but the invention is not restricted to this relation of the whip'roll to the pendulum arm so long as the pendulum arm stands in vertical position when the whip roll support is in its normal position.

Suitable means engaging the pendulum arm are Suitable means are also connected to the whiproll support which act to rock the support in opposition to the force exerted by the pendulum arm on the support and to move the whip roll against the warps and control the tension in the warps. This means may be of a usual type and is shown as a pair of arms i9 rigid with and extending rearward from the support and having suspended from their free ends weights 26 of suitable amount. The arms I9 are shown as rigidly secured to opposite ends `of the shaft i3 of the whip roll support.

The sheet of warps 2| is shown as extending from the warp beam up and around an idler roll 22, thence under and around a driven roll 23, thence forward over an idler roll 24 under another idler roll 25, and thence up and over the whip roll l2 to the front of the loom. But any suitable arrangement of these rolls may be made.

As previously noted in the construction of loom illustrated the warps are positively drawn off the warp beam against the action of the friction brake, in this case by the driven roll 23. This roll is shown as driven from a suitably rotated shaft 26 carrying a worm 21 engaging a worm wheel 28 driving a sprocket wheel 29 which drives a sprocket chain 30 which drives a sprocket wheel 3| on a shaft 32 journaled in the loom frame. Thisshaft 32 is geared to the shaft 33 of the roll 23--so that this roll is positively driven to feed the warps forward.

It will be observed that the force exerted, as by the Weights Z, on the whip roll support acts constantly, while the whip roll is in its normal position and at all other times, to press the whip roll against the-warps and thus to create tension in the warps. Consequently the tension in the warps alone-determines the normal position of the whip roll and in practice thewhip roll, after the beat-up, in many cases fails to return to the same position resulting in unsatisfactory control of the warp tension. But the force, whether weight or opposing springs, applied to the lower end of the pendulum arm has no effect on the tension of the warps when the whip roll is in normal position because the pendulum arm is then standing vertically. This force acts to control the tension in the warps when the whip roll is forward of normal position as in the beating-in of the filling and thus to secure the proper and required tension. The pendulum arm always acts to restore the whip roll to its normal position.

The relation between these two forces controlling the whip roll must, of course, be such that the pendulum arm shall act to restore the whip roll to normal position after each beat-up and the force applied, as by the weights 2S, shall be sufcient in opposition to the force exerted by the pendulum arm to move the whip roll against the warps and control the tension therein. This is readily secured by varying as required the weights IS and 29 and if necessary the relative lengths of the pendulum arm l5 andthe arms I9. Thus if a be the length of the arm I9, P the force exerted by the weights 20, b be the length of the pendulum arm l5, and PI be the force exerted by the weight I6 and moments be taken about the axis of the whip roll shaft aP must be substantially greater than bPl and t0 such an extent that the pressure exerted by the whip roll on the warps shall be suicient to produce the tension required therein.

Having thus described the invention, what is claimed as new, and desired to be secured by Letters Patent, is:

1. In a loom, a whip roll support journaled on the loom frame transversely thereof, a Whip roll mounted on the support parallel to its journal axis, a rigid pendulum arm rigid with and depending from the support and standing vertically when the whip roll support is in normal position, means engaging the pendulum arm acting to oppose swinging movement thereof and restore it to vertical position, and means connected to the support acting to rock the support in opposition to the force exerted by the pendulum arm on the support to move the whip roll against the warps and control the tension in the warps.

2. In a loom, a whip roll support journaled on the loom frame transversely thereof, a whip roll mounted on the support parallel to its journal axis, a rigid pendulum arm rigid with and depending from the support and standing vertically when the whip roll support is in normal position, means engaging the pendulum arm acting to oppose swinging movement thereof and restore it to vertical position, an arm rigid with the support, and means engaging the arm acting to rock the support in opposition to the force exerted by the pendulum arm on the support to move the whip roll against the warps and control the tension in the warps.

3. In a loom, a positive let-olf mechanism for the warps, a whip roll support journaled on the loom frame transversely thereof, a whip roll mounted on the support parallel to its journal axis, a rigid pendulum arm rigid with and depending from the support and standing vertically when the Whip roll support is in normal position, means engaging the pendulum arm acting to oppose swinging movement thereof and restore it to vertical position, and means connected to the support acting to rock the support in opposition to the force exerted by the pendulum arm on the support to move the whip roll against the warps and control the tension in the warps, to maintain in coordination with the positive letoi mechanism a continuous and uninterrupted flow of the warps under the proper and required tension.

4. In a loom, a positive let-off mechanism for the warps, a whip roll support journaled on the loom frame transversely thereof, a whip roll mounted on the support parallel to its journal axis, a rigid pendulum arm rigid with and depending from the support and standing vertically when the whip roll support is in normal position, means engaging the pendulum arm acting to oppose swinging movement thereof and restore it to vertical position, an arm rigid with the support, and means engaging the arm acting to rock the support in opposition to the force exerted by the pendulum arm on the support to move the whip roll against the warps and control the tension in the warps to maintain in coordination with the positive let-off mechanism a continuous and uninterrupted flow of the warps under the proper and required tension.

5. In a. loom the construction as defined in connected at their inner ends to the lower end of the pendulum arm extending in opposite directions therefrom longitudinally of, and connected at their outer ends to, the loom frame.

NORMAN H. FOX. 

